A circuit is a circular path. It could be the circuit of an electric current or the route of the Indianapolis Motor Speedway. If you’re promoting your new book, you’ll be making the talk show circuit.

What all these circuits have in common the idea of tracing a circle. A circuit preacher doesn't stay at one church, but instead travels from church to church, following a particular route. Originally US judges traveled from town to town, too, and today’s division of the country into twelve judicial circuits is a holdover from that era — "the Third Circuit," for instance, includes Delaware, New Jersey, and Pennsylvania.

Definitions of circuit
  1. noun
    a journey or route all the way around a particular place or area
    “we took a quick circuit of the park”
    “a ten-day coach circuit of the island”
    synonyms: tour
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    a walking trip or tour
    grand tour
    a sightseeing tour of a building or institution
    grand tour
    an extended cultural tour of Europe taken by wealthy young Englishmen (especially in the 18th century) as part of their education
    journeying from place to place preaching or lecturing; a preaching tour or lecturing tour
    package holiday, package tour
    a tour arranged by a travel agent; transportation and food and lodging are all provided at an inclusive price
    pub crawl
    a tour of bars or public houses (usually taking one drink at each stop)
    whistle-stop tour
    a tour by a candidate as part of a political campaign in which a series of small towns are visited
    type of:
    journey, journeying
    the act of traveling from one place to another
  2. noun
    movement once around a course
    synonyms: circle, lap
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    pace lap
    the first lap of a car race that prepares the cars for a fast start
    lap of honour, victory lap
    a lap by the winning person or team run to celebrate the victory
    type of:
    locomotion, travel
    self-propelled movement
  3. noun
    a racetrack for automobile races
    synonyms: racing circuit
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    type of:
    racecourse, racetrack, raceway, track
    a course over which races are run
  4. noun
    an established itinerary of venues or events that a particular group of people travel to
    “she's a familiar name on the club circuit
    “on the lecture circuit
    “the judge makes a circuit of the courts in his district”
    “the international tennis circuit
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    type of:
    itinerary, path, route
    an established line of travel or access
  5. verb
    make a circuit
    “They were circuiting about the state”
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    type of:
    go, locomote, move, travel
    change location; move, travel, or proceed, also metaphorically
  6. noun
    (law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations); one of the twelve groups of states in the United States that is covered by a particular circuit court of appeals
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    type of:
    group, grouping
    any number of entities (members) considered as a unit
  7. noun
    the boundary line encompassing an area or object
    synonyms: circumference
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    type of:
    border, borderline, boundary line, delimitation, mete
    a line that indicates a boundary
  8. noun
    an electrical device that provides a path for electrical current to flow
    synonyms: electric circuit, electrical circuit
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    bridge, bridge circuit
    a circuit consisting of two branches (4 arms arranged in a diamond configuration) across which a meter is connected
    a circuit consisting of a T-network with an additional shunt bridging the two series circuits
    closed circuit, loop
    a complete electrical circuit around which current flows or a signal circulates
    computer circuit
    a circuit that is part of a computer
    delay line
    a circuit designed to introduce a calculated delay into the transmission of a signal
    feedback circuit, feedback loop
    a circuit that feeds back some of the output to the input of a system
    an electronic circuit that can assume either of two stable states
    clipper, limiter
    (electronics) a nonlinear electronic circuit whose output is limited in amplitude; used to limit the instantaneous amplitude of a waveform (to clip off the peaks of a waveform)
    data link, link
    an interconnecting circuit between two or more locations for the purpose of transmitting and receiving data
    open circuit
    an incomplete electrical circuit in which no current flows
    pulse timing circuit
    a circuit that times pulses
    resonant circuit, resonator
    an electrical circuit that combines capacitance and inductance in such a way that a periodic electric oscillation will reach maximum amplitude
    series circuit
    a circuit having its parts connected serially
    squelch, squelch circuit, squelcher
    an electric circuit that cuts off a receiver when the signal becomes weaker than the noise
    tank circuit
    an oscillatory circuit
    a circuit formed by two equal series circuits with a shunt between them
    a circuit of wires for the distribution of electricity
    acoustic delay line, sonic delay line
    a delay line based on the time of propagation of sound waves
    control circuit, negative feedback circuit
    a feedback circuit that subtracts from the input
    electromagnetic delay line
    a delay line based on the time of propagation of electromagnetic waves
    gate, logic gate
    a computer circuit with several inputs but only one output that can be activated by particular combinations of inputs
    integrated circuit, microcircuit
    a microelectronic computer circuit incorporated into a chip or semiconductor; a whole system rather than a single component
    interface, port
    (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals)
    light circuit, lighting circuit
    wiring that provides power to electric lights
    computer circuit consisting of an assembly of electronic components (as of computer hardware)
    parallel circuit, shunt circuit
    a closed circuit in which the current divides into two or more paths before recombining to complete the circuit
    printed circuit
    computer circuit consisting of an electronic sub-assembly; copper conductors are laminated on an insulating board or card and circuit components are inserted into holes and dip soldered
    Wheatstone bridge
    a bridge used to measure resistances
    type of:
    electrical device
    a device that produces or is powered by electricity
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